Bugfix for empty $oldTag

[kiewietr]

empty oldTag tags get surrounded by newTag on every keystroke. This resulted in huge content. I dont know what the best solution would be but I added a simple contents().length check and only replace it when there is content inside the tag.

This would occur with tags when using font-awesome for example.

[Alex-D]

Hum, what about: #851
What's the best solution?

The original idea is to delete all empty tags, because there are useless.

[kiewietr]

The original idea is to delete all empty tags, because there are useless.

Sorry didnt see that one. I think it's an okay solution if you also have the keepEmptyTags option or some option to exclude certain tags from deletion, because we use font-awesome and these icons do use empty i tags.

<i class="fa fa-check"></i>

[Alex-D]

I understand, there is a list of tags to not delete here: https://github.com/Alex-D/Trumbowyg/blob/v2.11.1/src/trumbowyg.js#L1074

Maybe we should make it an option?

[Alex-D]

Ok, I add this to a fix I do.

Thanks.